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Egyptian riot police and government supporters attacked scores of pro-reform activists, beating them with clubs, kicking them and throwing them into police trucks during a Saturday demonstration in Cairo against President Hosni Mubarak.

Opposition groups tried to hold the protest in the capital's main square two days after Mubarak declared he would run for re-election in a Sept. 7 vote. The protesters, however, were met by a line of riot police blocking the square, The AP reported.

Several hundred protesters participated in the protest, chanting slogans against Mubarak.